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Store all of your projects ( class file and your source code ) that you are working on presently in a folder at C:\Java and then store everything that you have completed in a folder labeled C:\Java Projects.

This is what I do and it makes it much easier to work with so when you go into DOS all you have to do is change your path to "C:\j2sdk1.4.0_03" and change your directory to C:\Java ( type "cd c:\Java" at your command prompt without the quotation marks )